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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19fd3dffb1e38858c9e44ca14d4d0fe5b4b5dfe86eb840b84603ba91c3eecac' 
  AND token = 'oJoVingajSUy4DA/T7N0vGJT4llescwEwm3yPNtcH0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}